一 django 的分页器
1 批量创建数据
批量导入数据:
Booklist=[]
for i in range(100):
Booklist.append(Book(title="book"+str(i),price=30+i*i))
Book.objects.bulk_create(Booklist)
2 分页器的使用
book_list=Book.objects.all()
paginator = Paginator(book_list, 10) print("count:",paginator.count) #数据总数
print("num_pages",paginator.num_pages) #总页数
print("page_range",paginator.page_range) #页码的列表 page1=paginator.page(1) #第1页的page对象
for i in page1: #遍历第1页的所有数据对象
print(i) print(page1.object_list) #第1页的所有数据 page2=paginator.page(2) print(page2.has_next()) #是否有下一页
print(page2.next_page_number()) #下一页的页码
print(page2.has_previous()) #是否有上一页
print(page2.previous_page_number()) #上一页的页码
抛错
page=paginator.page(12) # error:EmptyPage
page=paginator.page("z") # error:PageNotAnInteger
3 view
from django.shortcuts import render,HttpResponse # Create your views here.
from app01.models import *
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger book_list=Book.objects.all() paginator = Paginator(book_list, )
page = request.GET.get('page',)
currentPage=int(page) try:
print(page)
book_list = paginator.page(page)
except PageNotAnInteger:
book_list = paginator.page()
except EmptyPage:
book_list = paginator.page(paginator.num_pages) return render(request,"index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body> <div class="container"> <h4>分页器</h4>
<ul> {% for book in book_list %}
<li>{{ book.title }} -----{{ book.price }}</li>
{% endfor %} </ul> <ul class="pagination" id="pager"> {% if book_list.has_previous %}
<li class="previous"><a href="/index/?page={{ book_list.previous_page_number }}">上一页</a></li>
{% else %}
<li class="previous disabled"><a href="#">上一页</a></li>
{% endif %} {% for num in paginator.page_range %} {% if num == currentPage %}
<li class="item active"><a href="/index/?page={{ num }}">{{ num }}</a></li>
{% else %}
<li class="item"><a href="/index/?page={{ num }}">{{ num }}</a></li> {% endif %}
{% endfor %} {% if book_list.has_next %}
<li class="next"><a href="/index/?page={{ book_list.next_page_number }}">下一页</a></li>
{% else %}
<li class="next disabled"><a href="#">下一页</a></li>
{% endif %} </ul>
</div> </body>
</html>
提高 弹性显示页码
def index(request):
book_list=Book.objects.all()
paginator = Paginator(book_list, 15)
page = request.GET.get('page',1)
currentPage=int(page)
# 如果页数十分多时，换另外一种显示方式
if paginator.num_pages>11:
if currentPage-5<1:
pageRange=range(1,11)
elif currentPage+5>paginator.num_pages:
pageRange=range(currentPage-5,paginator.num_pages+1)
else:
pageRange=range(currentPage-5,currentPage+5)
else:
pageRange=paginator.page_range
try:
print(page)
book_list = paginator.page(page)
except PageNotAnInteger:
book_list = paginator.page(1)
except EmptyPage:
book_list = paginator.page(paginator.num_pages)
return render(request,"index.html",locals())
二 自定义分页器源码
import copy
class Paginator:
def __init__(self,request,total_count,current_page=1,per_page_data_num=5,show_page_num=11):
self.total_count=total_count #数据总数
self.per_page_data_num=per_page_data_num #每页的数据个数 5
self.show_page_num=show_page_num #显示页面个数 11
self.request=request
self.params=self.get_params
try:
current_page = int(current_page)
if current_page < 1:
self.current_page = 1
elif current_page>self.get_page_num:
self.current_page = 1
else:
self.current_page = current_page
except Exception as e:
self.current_page = 1
self.half_num=self.show_page_num//2 @property
def get_params(self):
params = copy.deepcopy(self.request.GET)
return params @property
def get_page_num(self):
p_num,mod=divmod(self.total_count,self.per_page_data_num)
if mod:
p_num+=1
return p_num @property
def start(self):
return self.per_page_data_num*(self.current_page-1) @property
def end(self):
return self.per_page_data_num*self.current_page def html(self):
page_num_list=[]
# print(self.get_page_num) #页码四种情况配置
if self.get_page_num<self.show_page_num:
show_start=1
show_end=self.get_page_num+1
else:
if self.current_page<=self.half_num:
show_start = 1
show_end = self.show_page_num+1
elif self.current_page + self.half_num >= self.get_page_num:
show_start = self.get_page_num - self.show_page_num + 1
show_end = self.get_page_num + 1
else:
show_start=self.current_page-self.half_num
show_end=self.current_page+self.half_num+1 # 首页
self.params['page']=1
first_page = r'<nav aria-label="Page navigation"><ul class="pagination"><li><a href="?%s">首页</a></li>' %(self.params.urlencode(),)
page_num_list.append(first_page)
# 上一页
if self.current_page == 1:
previous_num = r'<li class="disabled"><a >上一页</a></li>'
else:
self.params['page'] = self.current_page-1
previous_num = r'<li><a href="?%s">上一页</a></li>' % (self.params.urlencode(),)
page_num_list.append(previous_num) #页码显示
for i in range(show_start,show_end):
self.params['page'] = i
if i==self.current_page:
li_num = '<li class="active"><a href="?%s">%s</a></li>' % (self.params.urlencode(), i,)
else:
li_num='<li><a href="?%s">%s</a></li>'%(self.params.urlencode(),i,)
page_num_list.append(li_num) # 下一页
if self.current_page == self.get_page_num:
next_num = '<li class="disabled"><a >下一页</a></li>'
else:
self.params['page'] = self.current_page+1
next_num = '<li><a href="?%s">下一页</a></li>' % (self.params.urlencode(),)
page_num_list.append(next_num) # 尾页
self.params['page'] = self.get_page_num
last_page = '<li><a href="?%s">尾页</a></li></ul></nav>' % (self.params.urlencode(),)
page_num_list.append(last_page)
return "".join(page_num_list)
调用方式
from django.shortcuts import render
from app01.models import Book
from page import Paginator def index(request):
#批量创建数据
# book_list=[]
# for i in range(1,101):
# book=Book(title="书籍%s"%(i,),price=random.randint(50,300))
# book_list.append(book)
# Book.objects.bulk_create(book_list)
data_list=Book.objects.all()
current_page=request.GET.get('page')
paginator=Paginator(request,total_count=data_list.count(),current_page=current_page)
data_list=data_list[paginator.start:paginator.end]
return render(request,'index.html',{"data_list":data_list,"paginator":paginator})
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> </head>
<body>
<ul>
{#数据显示#}
{% for data in data_list %}
<li>{{ data.title }}----{{ data.price }}</li>
{% endfor %}
</ul>
{#页码显示#}
{{ paginator.html|safe }}
</body>
</html>